Is argon gas a pure substance or a mixture. Is iron oxide dust a pure substance or a mixture.

The half-lives of isotopes are all measured in millions of years. a. True b. False

When two hydrogen atoms bond with one oxygen Atom to form water what happens to the electrons

Which property is true for metals? A. localized electrons B. high electronegativity C. low ionization energies D. tightly held valence electrons

What is the charge of an electron?

Why do elements in the same group of the periodic table have similar properties?

A whale is 24 meters long. A rhinoceros is 400 cm long. Which is longer? By how much?

Which statement is true about trends in metallic character? a) Metallic character increases as you go to the right across a row in the periodic table and as you go down a column.

How much energy is consumed by thawing 4.3 g ice? O A. 4.3 g x 1 mol/18.02 g 6.03 kJ/mol B. 4.3 g x 1 mol/18.02 g x 4.186 kJ/mol C. 4.3 g x 1 mol/18.02g x 40.65 kJ/mol D. 4.3 g x 1 mol/18.02 g * (-285.83) kJ/mol

Identify the product of radioactive decay and classify the given nuclear reactions accordingly.

Alkanes, alkenes, and alkynes are examples of A. aliphatic compounds B. aromatic compounds C. carcinogens